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1、BRITISH STANDARDBS 1560-3.1:1989Incorporating Amendment Nos. 1 and 2Circular flanges for pipes, valves and fittings (Class designated) Part 3: Steel, cast iron and copper alloy flanges Section 3.1 Specification for steel flangesUDC 621.643.4 034.14:669.13:669.35:621.643.411.412.8:001.4:006.3/.8Licen
2、sed Copy: Institute Of Technology Tallaght, Institute of Technology, Sun Jul 30 10:45:00 BST 2006, Uncontrolled Copy, (c) BSIBS 1560-3.1:1989This British Standard, having been prepared under the direction of the Piping Systems Components Standards Policy Committee, was published under the authority
3、of the Board of BSI and comes into effect on 30 June 1989 BSI 04-2000First published as BS 1560-2 November 1970First revision as BS 1560-3.1 June 1989The following BSI references relate to the work on this standard:Committee reference PSE/15Draft for comment 85/78241 DCISBN 0 580 17046 2Committees r
4、esponsible for this British StandardThe preparation of this British Standard was entrusted by the Piping Systems Components Standards Policy Committee (PSE/-) to Technical Committee PSE/15, upon which the following bodies were represented:British Chemical Engineering Contractors AssociationBritish C
5、ompressed Gases AssociationBritish Fluid Power AssociationBritish Foundry AssociationBritish Gas plcBritish Malleable Tube Fittings AssociationBritish Maritime TechnologyBritish Non-ferrous Metals FederationBritish Pump Manufacturers AssociationBritish Steel IndustryBritish Valve and Actuator Manufa
6、cturers Association Ltd.Combustion Engineering AssociationCopper Development AssociationDepartment of Trade and Industry (National Engineering Laboratory)Ductile Iron Producers AssociationElectricity Supply Industry in England and WalesEnergy Industries CouncilEngineering Equipment and Materials Use
7、rs AssociationGAMBICA (BEAMA Ltd.)High Pressure Pipework Consultative CommitteeInstitution of Gas EngineersInstitution of Mechanical EngineersInstitution of Production EngineersInstitution of Water and Environmental Management (IWEM)Water Authorities AssociationAmendments issued since publicationAmd
8、. No.Date of issueComments7557June 19938593July 1995Indicated by a sideline in the marginLicensed Copy: Institute Of Technology Tallaght, Institute of Technology, Sun Jul 30 10:45:00 BST 2006, Uncontrolled Copy, (c) BSIBS 1560-3.1:1989 BSI 04-2000iContentsPageCommittees responsibleInside front cover
9、Forewordiii1Scope12Ranges of nominal sizes13Class designations and pressure/temperature ratings14Materials15Bolting26Repairs27Dimensions28Flange facings39Spot facing or back facing of flanges410Tolerances411Marking4Appendix A Information to be supplied by the purchaser40Appendix B Application and in
10、stallation40Appendix C Determination of bolt lengths for lapped-type joints41Appendix D Recommended bolt lengths for flanges other than lapped-type41Appendix E Recommendations for weld ends of weld-neck flanges43Appendix F Dimensions of seamless and welded steel pipes44Appendix G Use of metric bolti
11、ng in lieu of inch bolting45Appendix H Comparison of flange descriptions in BS 1560-2:1970 with descriptions used in this Section of BS 156046Figure 1 Flange codes5Figure 2 Facings of types A to F and J6Figure 3 Reducing threaded flanges, Classes 150 to 25009Figure 4 Flange facings, Classes 150 and
12、300 only, for other than lapped-type joints11Figure 5 Flange facings, Classes 600 to 2500, for other than lapped-type joints12Figure 6 Facings for lapped-type joints13Figure 7 Dimensions of ring-joint facings (all Classes)15Figure 8 Dimensions of Class 150 flanges20Figure 9 Dimensions of Class 300 f
13、langes22Figure 10 Dimensions of Class 600 flanges24Figure 11 Dimensions of Class 900 flanges26Figure 12 Dimensions of Class 1500 flanges28Figure 13 Dimensions of Class 2500 flanges30Figure 14 Minimum fillet radius at the hub after back facing39Figure 15 Bolting for flanges, Class 150 to Class 250041
14、Figure 16 Recommended bevel angles for welding43Table 1 Types of steel flange1Table 2 Synoptic table7Table 3 Materials8Table 4 Reducing threaded flanges Classes 150 to 250010Table 5 Facing dimensions for flanges other than ring-joint, classes 150 to 250014Table 6 Dimensions of ring-joint facings (al
15、l Classes)16Table 7 Surface finish for facings A, B, E and F19Licensed Copy: Institute Of Technology Tallaght, Institute of Technology, Sun Jul 30 10:45:00 BST 2006, Uncontrolled Copy, (c) BSIBS 1560-3.1:1989ii BSI 04-2000PageTable 8 Surface finish for facings C, D and J19Table 9 Dimensions of Class
16、 150 flanges21Table 10 Dimensions of Class 300 flanges23Table 11 Dimensions of Class 600 flanges25Table 12 Dimensions of Class 900 flanges27Table 13 Dimensions of Class 1500 flanges29Table 14 Dimensions of Class 2500 flanges31Table 15 Tolerances32Table 16 Class 150: pressure/temperature ratings33Tab
17、le 17 Class 300: pressure/temperature ratings34Table 18 Class 600: pressure/temperature ratings35Table 19 Class 900: pressure/temperature ratings36Table 20 Class 1500: pressure/temperature ratings37Table 21 Class 2500: pressure/temperature ratings38Table 22 Minimum fillet radius at the hub after bac
18、k facing39Table 23 Determination of studbolt lengths for lapped-type joints41Table 24 Bolting for flanges, Class 150 to 250042Table 25 Dimensions of seamless and welded steel pipe44Table 26 Nominal bolt diameters45Table 27 Inch/metric bolt comparisons46Table 28 Steel flange descriptions and code num
19、bers specified in BS 1560-3.1:1989 and BS 1560-2:197046Publications referred to48Licensed Copy: Institute Of Technology Tallaght, Institute of Technology, Sun Jul 30 10:45:00 BST 2006, Uncontrolled Copy, (c) BSIBS 1560-3.1:1989 BSI 04-2000iiiForewordThis Section of BS 1560 has been prepared under th
20、e direction of the Piping Systems Components Standards Policy Committee and constitutes the first revision of BS 1560-2:1970. BS 1560-2 will be withdrawn 12 months after the publication of this Section of BS 1560. For PN designated steel flanges, reference should be made to BS 4504-3.1.It was origin
21、ally intended that BS 1560-2:1970 would be superseded by a British Standard technically equivalent (or identical) to an International Standard for a single series of flanges when finalized by ISO1)/TC 5/SC 10, Metallic flanges and their joints. However, the International Standard has not been finali
22、zed but this revision of BS 1560-2:1970 incorporates the principles of the international work.To align with the format of ISO 7005, BS 1560-3 will be published in three Sections. Section 3.1: Specification for steel flanges; Section 3.2: Specification for cast iron flanges2); Section 3.3: Specificat
23、ion for copper alloy and composite flanges.BS 1560-2:1970 was based on American standard ANSI B16.5 published by the American National Standards Institute, and, until such time as ISO 7005-12), Steel flanges is published, and BS 1560 is further revised, this Part of BS 1560 continues to specify stee
24、l flanges that are interchangeable with flanges made to ANSI B16.5.In ANSI B16.5 some dimensions are rounded decimal inches; however, in Section of BS 1560, all metric dimensions have been calculated from the original ANSI B16.5 fractional inch sizes.The flanges specified in this Section of BS 1560
25、are intended to be interchangeable with, but not necessarily identical in every detail to, steel flanges manufactured to BS 1560-2:1970.This Section of BS 1560 differs from BS 1560-2:1970 for the content covering the steel flange requirements in the following respects.a) In this Section of BS 1560 t
26、he descriptions of the various types of flanges have been augmented with code numbers. The code numbers adopted are based on the type numbers specified in ISO 7005-1.b) Plate flanges for welding, for Class 150 designations only, are included for the first time.c) The 31/2 in nominal size has been om
27、itted.d) Class 400 flanges have been omitted.e) The pressure/temperature ratings are based on ANSI B16.5 and it should be noted that there are some differences to the ratings given in BS 1560-2:1970.f) Materials specified have been revised, new materials added and reference is made to comparable AST
28、M3) materials. Generally, the range of materials corresponds to those given in ISO 7005-1.g) All flange dimensions are within approximately 0.5 mm of the proposed International Standard and ANSI B16.5 metric dimensions so the flange dimensions of BS 1560-2:1970 generally have been retained. Inch dim
29、ensions have been retained for bolt holes to accommodate inch dimensioned bolts.h) Due to minor differences in the dimensions of ring joint facings between BS 1560-2:1970, ANSI B16.5 and ISO 7005-1, the ring joint dimensions in this Section of BS 1560 have been re-calculated from the ANSI fractional
30、 inch sizes.1) International Organization for Standardization.2) In preparation.3) American Society for Testing and Materials.Licensed Copy: Institute Of Technology Tallaght, Institute of Technology, Sun Jul 30 10:45:00 BST 2006, Uncontrolled Copy, (c) BSIBS 1560-3.1:1989iv BSI 04-2000i) Tolerances
31、have been compiled from requirements given in BS 1560-2:1970 and ISO 7005-1.j) Requirements for the surface finish of flange faces have been given in greater detail.k) The small spigot and recess flange facings (previously designated as small male and small female) and small tongue and groove facing
32、s have been omitted from this Section of BS 1560 since no requirements exist nationally. Therefore throughout this Section of BS 1560 reference is made to spigot/recess facings which correspond to the previously designated large male and large female and to tongue and groove facings which correspond
33、 to the previously designated large tongue and groove.l) Spot facing or back facing complies with ISO 7005-1.m) The marking of flanges is basically in accordance with the principles of ISO 7005-1 but limitations on the methods are included.n) For threaded flanges, BS 21 thread form is specified in a
34、ddition to ANSI/ASME B1.20.1 and API 5B.o) Appendix A lists information that should be supplied by the purchaser when ordering flanges.p) Guidance notes and recommendations contained in BS 1560-2:1970 and similar notes in ISO 7005-1 have been included in Appendix B. Appendix B is not intended to be
35、exhaustive.q) Since BS 1560-2:1970 was published the lengths of stud bolts and headed bolts have been increased by 1/4 inch in ANSI B16.5 in many cases. These revised lengths have been incorporated in this Section of BS 1560 (see Appendix D). Furthermore, since bolt sizes are expressed in inches in
36、this Section of BS 1560, it has been agreed that it is more logical to express the lengths of bolts in inches also.r) For information, pipe dimensions for flanges are given in Appendix F. The nominal size of a flange is the same as the corresponding nominal pipe size.s) Details of minimum hub radius
37、 after back facing are included.t) This Section of BS 1560 specifies inch bolting only and the use of metric bolting is outside the scope of this Section of BS 1560. Appendix G gives the proposed metric bolt sizes to be used in lieu of the inch sizes specified, together with appropriate warnings.u)
38、The specification of gasket types, materials and dimensions previously contained in BS 1560-2:1970 have been omitted from this Section of BS 1560.Dimensions of gaskets for use with steel flanges to BS 1560-3.1 are specified in the following British Standards.BS 3381, Specification for spiral-wound g
39、askets for use with steel flanges to BS 1560. BS 7076, Dimensions of gaskets for flanges to BS 1560 Part 1 Specification for non-metallic flat gaskets Part 2 Specification for metallic ring-joint gaskets Part 3 Specification for non-metallic envelope gaskets Part 4 Specification for corrugated, flat
40、 or grooved metallic and filled metallic gaskets. For comparison purposes, the descriptions of flanges used in this Section of BS 1560 are compared with the descriptions given in Appendix H of BS 1560-2:1970.Assessed capability. Users of this Section of BS 1560 are advised to consider the desirabili
41、ty of assessment and registration of a suppliers quality systems against the appropriate Part of BS 5750 by a third party certification body.Licensed Copy: Institute Of Technology Tallaght, Institute of Technology, Sun Jul 30 10:45:00 BST 2006, Uncontrolled Copy, (c) BSIBS 1560-3.1:1989 BSI 04-2000v
42、A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application.Compliance with a British Standard does not of itself confer immunity from legal obligations.Summary of pagesThis document comprises a f
43、ront cover, an inside front cover, pages i to vi, pages 1 to 48, an inside back cover and a back cover.This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.Licensed Copy: Institute Of Tec
44、hnology Tallaght, Institute of Technology, Sun Jul 30 10:45:00 BST 2006, Uncontrolled Copy, (c) BSIviblankLicensed Copy: Institute Of Technology Tallaght, Institute of Technology, Sun Jul 30 10:45:00 BST 2006, Uncontrolled Copy, (c) BSIBS 1560-3.1:1989 BSI 04-200011 ScopeThis Section of BS 1560 spec
45、ifies requirements for Class designated circular steel flanges of Class 150 to Class 2500 and in nominal sizes up to 24 in of the type given in Table 1.Table 1 Types of steel flangeThis Section of BS 1560 specifies types of steel flanges and their facings, dimensions, tolerances, threading, bolt siz
46、es, flange face surface finish, marking, materials for bolting and flange materials together with associated pressure/temperature ratings.The weld end preparation of weld-neck (code 111) flanges (see 7.4) and the routine inspection and testing of flanges are outside the scope of this Section of BS 1
47、560 but some guidance on maximum test pressure is given in Appendix B.NOTE 1To assist purchasers Appendix A lists information which should be supplied when ordering flanges.NOTE 2The titles of publications referred to in this standard are listed on the inside back cover.2 Ranges of nominal sizesThe
48、ranges of nominal sizes from1/2 to 24 applicable to each flange type and for each Class designation shall be as given in Table 2.3 Class designations and pressure/temperature ratings3.1 Class designationsThe range of Class designations shall be as follows:Class 150;Class 300;Class 600;Class 900;Clas
49、s 1500;Class 2500.3.2 Pressure/temperature ratingsThe pressure/temperature ratings of the flanges manufactured from the materials specified in Table 3 shall be as given in Table 16 to Table 21 for applicable materials and shall be the maximum allowable non-shock working gauge pressure at the tempera
50、ture shown.NOTE 1Linear interpolation is permitted for intermediate temperatures. The relevant pressures and temperatures are those of the fluid in the pipework system.NOTE 2The rating of flanges is not necessarily the rating of the whole pipework system. Gasket materials can also impose limitations